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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c5629cae0ca0cc2e3af53e2dfec8bbfe09d74c3ecb0f3290615eccf47d55d08' 
  AND token = 'aF0VnmKRoEqoz1KpfBQOop1ZsvGAU9w5VoZOshmF1M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}