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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb7d94355f20e50a7179159fb05885d42e480edea32cc9e4ee3d3cfead45e424' 
  AND token = 'b6zLvz9WHlDdE3V9OL0zi1ONJGG4ouZNhdf3Q6By0d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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