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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3594022cf019cf1e1b6c8a679e4e52676d3e7f2aacdc8da2341df6d58487a01e' 
  AND token = 'zL2E1aI4GY2NefJ01fFHhrXJfNNdRKO3Jr9OzU3845E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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