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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f788c94b7a44f57bf4247abbfeee68b5eb3549f8c473e3b33118a14a1c4fd51c' 
  AND token = 'Kt1Vg7cK8Z11p+1/xMxAY8BK+ud1IUw6VknsNdaijlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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