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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d504efc028ba7b8c03ed25a37e8fff6d3a01f05a3f2ef7ef2e22027275ad93c' 
  AND token = 'Cs3yEU0MS0BqKO4Qvpac8jryt8r/8CnKO+crbCdwxH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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