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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3d40f78dfb0ef25ac962db6917c50f08a1daf3e1287f54a2571c344dd5f7d8b' 
  AND token = 'dO0+jE3Udc+pIiHSs/ex7JlzeoNxPBvybnkcew0kdgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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