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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48cf0868525a10f96f752e8ca5f1bc44db8b99f8b9606278f3e004d4165e403a' 
  AND token = 'tgEkY5zVpf8cc5WYVP4PYOcnQbsosYws8z4jBdTcy3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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