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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93a669d30aa2144a22cf3408093215e7f25368a2e198392e32dd09933ed4b577' 
  AND token = 'clXPqj8sZtO66jMtsJw6smEEIDuy23ypf7+O2gxdQUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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