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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f90f515422f0140f27dbe88d3010a4ad5be27bda0ff918eb3d3385c15e0beb8' 
  AND token = '3sRSU7ug5UBgmBBYUkoIlFL4P0br8+bE0ixEn5YmzOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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