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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cfc1b89353c86725624474e1450ee8bca3655655a49f5b3db508e40964ec1fe' 
  AND token = 'YcLUrNcEdi6SGGp/S2gJXD+72NAplNMdYd7DKewVzXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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