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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f7f65dcc6cbc8452d983870968e3e60d4ccff47bb7c858aaad9e5703e54246' 
  AND token = '2k5ueeqHuw1F1y2AcZoZXn19STvbLipG5nd/PYrvmYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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