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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e82bd12eecaeabcfbdf725d975de24d26888e1e7a6da8f20f6adb3d9a1329b' 
  AND token = '90QgLb41hgM+tqPzqBi7md8F9L9N4RcVeMxoaoXZNIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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