SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0edca64a00b8d88862fcc1d23d3278b74d585f819e60b40b7fdfcaac5c4972da' 
  AND token = 'E1wn/mj1qDi9xYWtO+rXjcwJiZE1KYIm+/Fx46IZ7Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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