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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dfd7e9018bc95f212047a871a0d910d1cc8be4e78f47a2bf50ad86bf78c5f68' 
  AND token = 'tvA03MUu4KiG4aopG7Ipirysd8EKhwnQOby3pP4/q8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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