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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edc15ab5062121fbbb380c123e4cd99ff9d07f039d1934760375ded937ddec39' 
  AND token = 'NWK4i2MjLvitYzjNTA8cjbi26V4WZrfqB9SR49vp7VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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