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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ecfa51b2be91e459b3fea50f85824670bdbdd5367a8abdc63869aa1064ee073' 
  AND token = 'RqTvCECoxqe0m/TKvxHm2YBSoBhQEpHtK6dOeC6yuko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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