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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dff4c4601da092aea7f370f7910fbf7cfc13c5928b820e5a03d023876e9f700' 
  AND token = 'k2NcDyB0gCyq7L88dE9UGhB7ca0Vdu162uL4H/joAzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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