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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd42f97236903073c8310e189b499f319c5b2adfe318d45988a7b71a03e6bb6ae' 
  AND token = 'pL7WuB6o5W5GLnBlL5WC2A7t0XwFcq1YEh+tYidntIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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