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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a72516c77df61fcecd8a46b7886b4a964ea2ad0888a6c6fcee1aefe594e6ad6' 
  AND token = 't2EWVAJzgOolyQO4cv3dBIUaSwFoMuqRzIpeFj7vgOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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