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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05fe26756105c253324947e8ad2dd822b786c103f7f9e0059d7daf76beaf7da4' 
  AND token = '4jzKfcDTMNUU5xfANcdzpu4DoRGxke3+DbRyKDvphHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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