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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f71d8604e418c6ca8e632ae3fb07ac6316d7d79e7b1c9fd50b6e799f493a771e' 
  AND token = 'ITWU2jXnzadsSBxD36Lzf9LbyTViWPgfRuA9ipgIvQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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