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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bad6c4df55325386636c588113b72bbc73a843d22e44f35e0bb29e4436f49402' 
  AND token = 'GZa4HoHkmV9Mi2VZZQnUyI47TQRixKhDGZceHFd5Zm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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