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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4124da8ea0c3ffeb165a336caeb5ab6fd27eb8080a7513601ab0c5601e0d4a20' 
  AND token = 'TZRWDqwH6L8AOqzHzt85olcLf/AqAHn4QTWdgJ+tMhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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