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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69b25bd9afb601fc1b1428d9d1e15b3dbd98eea8703d1f16acf24e831d6f8c74' 
  AND token = 'SnTEAXamRh0NE2C1RLwEKwZHqXS1xDnAQOQFuv8lkHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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