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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5edfdb93b5acbf6c9b30322e746a4d39e825ea5bc85a561424c852b571d2a936' 
  AND token = 'wpJ0JcUt/nOXUaziIh+emF5u8/75t63e2u95NOCTCvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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