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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1cbc31c21849d01956ac5e0623e39abcf37957238c13096427e325d81db332b' 
  AND token = '9x1SS4C8dCYnl+Z0JH1VK/27pTB0QXWbzZTCi90A6I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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