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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '363131c56fdd77eada1e3cf12dade02bceb04697a7121b7c9b42a086e76da09d' 
  AND token = 'irJJFk+2Y/hpJ0uBSiI6/3uE8ysfkSbMLgN0Dws4wrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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