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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d0d406a2bbb8e56119e7f878ce9739c95ca7b20824c3bf769c6477c4be49ee1' 
  AND token = 'zaEEVNivM4EBWRkORLwezkUS39pO3StFFJTCvYOL9Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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