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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e35e94edd2ae799afc07908142208b8aa9380acac11db0e73fc567fb7821aac' 
  AND token = '6IOsWsT3Pmu657LbUvdEqbnSLsrA11yo9CbNq2teQDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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