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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b62aa2e4db163f736429f0ceebfe0f04646c20fc4bf894ba1411c6d1a90a386b' 
  AND token = 'WdwTzhFp0aT/tka9mjsZTFgqqB8Kl7iuRTZKiH34U78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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