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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40efd6f125f3f77b5ceede22117cebf214108fc599ab10237f7dc91ef290e10c' 
  AND token = 'dS9tWMws4dI04ELcayKupM3f8SXVY2xfAJVRu4qq5oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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