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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ef8a56b5240070e231306481f8ab18984f03e34de667f425a9835d50cb88b3c' 
  AND token = '6r049Tf+UaLW5+SV/z4zo4acrvoKw39h8DbdgqVxW/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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