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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46b7502829238de763d4b6b6627b247ee697c2cef0bfa798fa2669dcf5eb3277' 
  AND token = 'NovxGfhsAxLpFOaHUcbRJHa7gx+y+tfjFcGV8plbwog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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