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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '174c7fae338271e07cf2d159ec5afe1227aeebec4a6dad25a0bbca83e89d58bc' 
  AND token = '4G9TIam87X+Wqcogdv0nP4U5M8m1dvRz+HsRcWnRLd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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