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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fdb5455891c1ad768775977e70ff3f58a65cd482e8b8c2eb92b87a7ab528f82' 
  AND token = 'nmioEPm3wfRJWhBIL65auXYefPQ9wPt88yAWYSp2EZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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