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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c41aaeb62e74c9f58eeb1ae8bb001eda0449711ed91cb0e0a4ec810850e2148' 
  AND token = '8pD+BOUA1ms/RSu7ULtETNVSQUHTBQMfm0MYazNouEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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