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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0304f768e90c2b3264a6180a4fb8a8b96cc74f18394bb305ddb15dbb384abce6' 
  AND token = 'xq1T2hly1CZ7g9tgyxiBZnrXSDoNiPbORPO0OLSqc+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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