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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cdf2e8f333555b7036b97371921cc4d4cbe0e5c739c1540d6d6503301733511' 
  AND token = 'jCyMxaOk6KtT0xO4pOwuzWlBNPX3olDWGuN9lmHSSD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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