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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f1e85b4cc3e7349fa9ee83bb064da9f7fbef58b6cb7b9f55da68312c8791106' 
  AND token = 'gUQ9+FiL8pr7raPSOOlub4Htv4Q8GUWehGUFeVevALc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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