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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8442b7715bc52f272d59eb35323fa7947ae286bf7331bcb0212a362c2113363' 
  AND token = 'VqMhkGNq3d/ybrUl+y8+hY3Q34salFGEQyLhd6OYEgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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