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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58091fe74e19141c63b00b0b674c08e4123d611bfe2050923609540b0bdb17f2' 
  AND token = 'ir5zxzsa3XGKGuWMK9a93qj8AiBkxtSwy/xM8QQgk8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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