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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad4a405333dead6cf3225efbd0d2e62de8a0d6e65160b1cd353c4622f9cb72eb' 
  AND token = 'SYfGNsC7/WPciwqQOarewLJ/rHSXoed8+LB7mxqBhxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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