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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5613136c139efe6e7111dc3be15b948aa3987c5d0189e7fedce8c5b29f6f47f8' 
  AND token = 'K32ObjmiUpj6Sx0E+Hd7bYQDAAQHFC8gukE7qxM124A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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