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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f11a8d1aea1985e2364af055e27cd4380dff9b7ca01d7029fbfceb28aca647d' 
  AND token = 'EwsTBWmAjqSL3KHC1NRWmEEE2deNmUr9N6/h0CL+Kc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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