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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '041322da4ac42f33e4e9bfe04c6bf0f4992940abc0375d68538fe8ba2dc56d44' 
  AND token = 'l7CBgzbI8E20YiJUVIX1NhKMPX6cfyzOZqNE6MoFt0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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