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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40ca051fcbd23829a193e8ecf01f8ffd02cb11a47b42cf7bbc5209c1965bcb2f' 
  AND token = 'X8GcfwPn+49QB4u8PXWduT0AFj8n9S66htqpwqoWUAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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