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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23ca73b53fd97fa9086703aee4fb29717ab4c4599e86e95455549666afab1b0f' 
  AND token = 'nSU60ERXb6Q+CZXVqO3bN2tu60lxPNZM5QvxjhDWzbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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