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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '716427dd22c2714d31e4f5a8b14b09d3e2c938ba0bfff76f132041d1b73cc79d' 
  AND token = 'WFuiEmX5enwGe+NfCor0rhSqiLFxwOryWw+RMcn7KOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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