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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e7cf2caf55fce879d72bdcf8a6acd6ddd8a88c4eb8c7b173377894d5e3319bb' 
  AND token = 'ZVLSHdVKEV7xhYaylVN3xuDBoDibZs4pjiD4DhXNZ64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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