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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32c07bef2c4d3752027730f3c879a554d8a7b2aeb0890d1a61bd9b0f201833eb' 
  AND token = 'r78I4Kep6FHOkO9kRDmcmBTU0Qin5BBwLjDhyhrGa1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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