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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18eb47ac2c997d1fc3e98e0dff2871e8d62a02ff0c96d78dd7846e1ff6c78178' 
  AND token = '06kEyeRdAR75hk0CIJ54wcLA4jvHp9ys/8ML3aQArDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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