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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15d0c65812004090637fc7b6eb7e09e18b29813869973aab986c89360002ffa6' 
  AND token = 'nRBLmAkfne6Nvl/6V2Xs52zcd4wcL9Kz33iWGbpA9Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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