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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce66132c73dc11e88503c7273b0705b95ce9f00f918715312e7e981129a0d167' 
  AND token = '2ki11WUCTo/Mx4sKEXKn/+W376RQ14i+z5it2T5n5A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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