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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e723bdd03bcc06efd623ee47ae74b717eb6179802a9b28ff4c6a31b8ebfcb463' 
  AND token = 'Vozfe8vgd4CCWcUOBhDXuJfNy34emSRLfHvc/l0vL5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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