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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f21de155ddf442bfd81debb0bcd9a16c78c3816345e4a2388277816abe7da3' 
  AND token = 'nJK5xSP8A2E/7MHol274JyPKuQMk5DQTQEfhrxbg7Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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