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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b19e87bdaad255a7b3e1fe925e6d99d49bdfb9a299fd90b1f67dfaebe2ab8aa2' 
  AND token = '0YU+64kSO015DiMNpODiOPfDQ4Wq5/9vJgMWJm7HwkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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