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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '718a53e23c41ed26cc0f04320aa181858a4484e3d0b27c2cedf9cf36fd24ffbe' 
  AND token = '6xbnpFXJgzmJxcnqKnDZ146dfKOIDwfNr3xYkVj2VEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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