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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59a139e63e719b0d0ee26f596e1d4ee04233c2ae4d127ece54665de9bcc6269a' 
  AND token = 'HuwVP/b3GOXE4dsejf0/v5c9/ssHFBnqp6jCflfFC0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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