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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa54f64dff453849bc62f982caa088439a396e7233aad61ade23ffc91cd841a0' 
  AND token = '8cPGXVTc+6uqXqYqNdtK2sYzaFDzY/8acshKkZeDnxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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