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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a61a59bd2b502666827fc2e01e6681acf88d7e6eef1d9ca49bc8bb941a5314fd' 
  AND token = 'wOEhxQ/Sz/wbWNIv2Elfuv20l4fW9ezQHEAyzaDOexQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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